I've been wanting to do something with this lang for a while. I don't have much yet, but I'm going to use this thread to post new things. I'll try to post something small every few days. Some of this post is copied and pasted from other posts, but I wanted to consolidate it.

Otvei is meant to be a personal language (not spoken by a conpeople). I'm not going to worry too much about naturalism, especially with regularity. It's going to be a pretty straightforward language.

Phonology

The orthography is the same, except /ŋ/ is written <g>.

The actual phonemic realizations of /r, e, o, a/ in most positions are /ʀ, ɛ, ɔ, ɑ/, but it's easier to use more basic symbols (especially since they don't contrast).

Hangul orthography (No reason, other than that Hangul works well with this.)

Here's the script I made. It's difficult (impossible?) to make curved corners work in Fontstruct, with all the different character combinations, so I decided to stick with the blocky look for now.

It's a featural syllabic alphabet. Each character is divided into three parts: the top section is for an optional onset consonant, the middle is for the vowel, and the bottom section is for an optional coda consonant.

To see what I mean, here are all the possible syllabic blocks (Warning: big):

Spoiler:

Upcoming

As far as grammar goes, I don't have much yet.
Word order: SOV
Nominative-Accusative alignment
Cases: Nom, Acc, Gen, Dat, Prepositional, possibly Instrumental
Noun-Gen order
Noun-Adj order
Prepositions
Subject marking on verbs
If you read all this, thanks for sticking around. Hopefully I'll post some more in the next few days.

I also made a noun declension with cases. I decided on including nominative, accusative, dative, genitive, and prepositional cases. All cases are marked with suffixes, but nominative singular is unmarked. Plural is marked with -u, which is inserted between the noun and the case marker.

Nom: Used for the subject of an intransitive verb, and the agent of a transitive verb.
Acc: Used for the object of a transitive verb.
Dat: Used for the indirect object in a verbal clause with three arguments.
Gen: Possessive/shows relationship to. Used for both alienable and inalienable possession.
Prep: Used for the object of a prepositional phrase.

It's been a while, but I've made a small development. I decided how I want to handle numbers larger than 10. Let's take the number 654. This would be literally translated as "hundred six ten five four," or (100 x 6) + (10 x 5) + 4. This is because adjectives follow the word they modify. Also, numbers cannot take the plural suffix -u.

But for a number like 102, this could be confusing. Instead of saying "hundred two," which could be interpreted as meaning "two hundred," you would say "hundred and two."

Similarly, 112 would be literally translated as "hundred ten and two." This can't be confused with the grammatically incorrect 1002 (*ten hundred and two), because 1000 would have its own word.

If the rules for when to add the word "and" are confusing, just leave it out unless it's necessary for disambiguation. As for numbers larger than 9999, I don't know yet.